31. Radiographic enlargement to distinguish small defects is possible
32. A suitable technique for monitoring a growing crack in an alloy is
33. Which of the following techniques are not applicable for detecting internal flows in a ceramic material?
1. Liquid penetration test
2. Radiography
3. Ultrasonic testing
4. Eddy current method
1. Liquid penetration test
2. Radiography
3. Ultrasonic testing
4. Eddy current method
34. Which penetrant process is best suited to detect shallow discontinuities?
35. For HRA scale load and indenter are used
36. Which one of the following NDT techniques cannot be used to detect an internal crack in a steel shaft?
37. The ASTM grain size number N for a structural steel which shows 65 grains per square inch at a magnification of 100X is
38. Match those listed in Group 1 with the NDT methods listed in Group 2.
Group 1
Group 2
P. Penetrameter
1. Ultrasonic test
Q. Differential coil probe
2. Dye-penetrant test
R. Piezo-electric probe
3. X-ray radiography
S. Developer
4. Accoustic emission test
| Group 1 | Group 2 |
| P. Penetrameter | 1. Ultrasonic test |
| Q. Differential coil probe | 2. Dye-penetrant test |
| R. Piezo-electric probe | 3. X-ray radiography |
| S. Developer | 4. Accoustic emission test |
39. A pearlitic steel is observed under an optical microscope which has a numerical aperture (N.A) of 1.5 and uses the radiation of 4500A. The minimum lamellar spacing (in A) which can be resolved using this microscope is
40. A common use of ultrasonic testing is
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